/*
 * Copyright 2011-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sabayframework.cluster.impl;

import org.sabayframework.cluster.Node;
import org.sabayframework.cluster.NodeId;

public abstract class BaseNode <T extends NodeId, P extends NodeId> implements Node {

	protected T id;
	private P parentId;
	private static final NodeId[] EMPTY=new NodeId[0];
	
	public BaseNode(T id, P parentId) {
		this.id = id;
		this.parentId = parentId;
	}

	public BaseNode(T id) {
		this(id, null);
	}

	protected BaseNode() {
		this(null, null);
	}

	public final NodeId getId() {
		return id;
	}

	protected final void setId(T id) {
		this.id = id;
	}

	public NodeId[] getChildrenIds() {
		return EMPTY;
	}

	public NodeId getParentId() {
		return parentId;
	}

	protected final void setParentId(P parentId) {
		this.parentId = parentId;
	}

	public int getChildrenCount() {
		return 0;
	}

	public int hashCode() {
		return id.hashCode();
	}

	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		BaseNode<?, ?> other = (BaseNode<?, ?>) obj;
		if (id == null) {
			if (other.id != null)
				return false;
		} else if (!id.equals(other.id))
			return false;
		return true;
	}

}
